单项选择题
How do you read? I read you four.（）.
A.excellent B.bad C.fair D.good
单项选择题 A vessel not using a traffic separation scheme shall avoid（）by as wide margin as practicable.
单项选择题 A vessel not using a traffic separation scheme shall avoid it by as（）as is practicable.
单项选择题 Two short blasts of the whistle have all of the following meanings except（）.
